MGSE1.OA.3

Apply properties of operations as strategies to add and subtract.5 Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known(Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12(Associative property of addition.)